Pricing, context window, capabilities, and release date — pulled from each provider's public docs. Both are available via the same AIgateway OpenAI-compatible endpoint; flip the model string to switch.
Both models stream in parallel through your own AIgateway key. Tokens, latency, and cost update as they arrive.
| Gpt-Oss-120b openai/gpt-oss-120b | Gpt-Oss-20b openai/gpt-oss-20b | |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Family | GPT OSS | GPT OSS |
| Modality | text | text |
| Context window | 128,000 tok | 128,000 tok |
| Max output | 4,096 tok | 4,096 tok |
| Released | 2025-08-05 | 2025-08-05 |
| Input price | $0.350 /1M | $0.200 /1M |
| Output price | $0.750 /1M | $0.300 /1M |
| Cache read | — | — |
| Tools | yes | yes |
| Streaming | yes | yes |
| Vision | — | — |
| JSON mode | yes | yes |
| Reasoning | yes | yes |
| Prompt caching | — | — |
OpenAI’s open-weight models designed for powerful reasoning, agentic tasks, and versatile developer use cases – gpt-oss-120b is for production, general purpose, high reasoning use-cases.
OpenAI’s open-weight models designed for powerful reasoning, agentic tasks, and versatile developer use cases – gpt-oss-20b is for lower latency, and local or specialized use-cases.
# pip install aigateway-py openai
# aigateway-py: sub-accounts, evals, replays, jobs, webhook verify.
# openai SDK: chat/embeddings/images/audio — drop-in compat per our SDK's own guidance.
from openai import OpenAI
client = OpenAI(
base_url="https://api.aigateway.sh/v1",
api_key="sk-aig-...",
)
# Try Gpt-Oss-120b
client.chat.completions.create(
model="openai/gpt-oss-120b",
messages=[{"role":"user","content":"hello"}],
)
# Try Gpt-Oss-20b — same client, same key
client.chat.completions.create(
model="openai/gpt-oss-20b",
messages=[{"role":"user","content":"hello"}],
)